Pseudo-Democritus was a 2nd century AD Greek philosopher, and the second most respected writer on alchemy (after Hermes Trismegistus

Hermes Trismegistus

Hermes Trismegistus is the eponymous author of the Hermetic Corpus, a sacred text belonging to the genre of divine revelation.-Origin and identity:...

). Two of his works survive, Physical and Mystical Matters, and Book addressed to Leukippos. He wrote many other books that are quoted extensively by Zosimos of Panopolis

Zosimos of Panopolis

Zosimos of Panopolis was an Egyptian or Greek alchemist and Gnostic mystic from the end of the 3rd and beginning of the 4th century AD. He was born in Panopolis, present day Akhmim in the south of Egypt, ca. 300. He wrote the oldest known books on alchemy, of which quotations in the Greek language...

. He is mentioned in the Stockholm papyrus.

Physical and Mystical Matters describes "An art, purporting to relate to the transmutation of metals, and described in a terminology at once Physical and Mystical", branding him as an alchemist

Alchemy

Alchemy is an influential philosophical tradition whose early practitioners’ claims to profound powers were known from antiquity. The defining objectives of alchemy are varied; these include the creation of the fabled philosopher's stone possessing powers including the capability of turning base...

for all time and provides straightforward recipes for making imitation gold and silver (alloys).